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Linking climate change and geohazards. Geohazards?. What’s the short-list of geohazards potentially relevant to my MCCAP? How are they relevant, and are they priorities?. THANK YOU! Garth DeMont , Geoscientist with NS Department of Natural Resources

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slide2

Geohazards?

What’s the short-list of geohazards potentially relevant to my MCCAP?

How are they relevant, and are they priorities?

  • THANK YOU!
  • Garth DeMont, Geoscientist with NS Department of Natural Resources
  • Gavin Kennedy, Hydrogeologist with NS Department of Natural Resources
  • John Drage, Hydrogeologist with NS Department of Natural Resources
slide3

Assessing Geological Hazards

Geo-events that pose threats

4 of 30

  • coastal flooding & riverine flooding
  • coastal erosion
  • land sinking – sinkholes
  • contamination of water from heavy metals in soil or acid rock drainage
  • landslides / slope failure

. . . to develop a methodology to incorporate geology

into the land use planning process

Picture from NS DNR Geological Services Division

slide5

Assessing Geological Hazards

Geohazard—Coastal erosion

4 of 30

The need to establish setbacks should be informed by

geology – both bedrock and surficial

. . . to develop a methodology to incorporate geology

into the land use planning process

Coastal erosion risk will increase with sea level rise.

Picture from NS DNR Geological Services Division

Picture from NS DNR Geological Services Division

slide6

Assessing Geological Hazards

Geohazard—Karst

4 of 30

  • Occurs in
  • limestone & gypsum
  • sinkholes
  • water contamination

. . . to develop a methodology to incorporate geology

into the land use planning process

Under the Nova Scotia Treatment Standard for Municipal Surface Source Water Treatment Facilities, once designated, karst areas are subject to water treatment standards.

Picture from NS DNR Geological Services Division

Picture from NS DNR Geological Services Division

slide7

Assessing Geological Hazards

Geohazard—Heavy Metals

4 of 30

  • Toenails, Tap Water and You: The Arsenic Connection
            • NS DNR Report of Activities: 2009

Picture from NS DNR Geological Services Division

slide8

Assessing Geological Hazards

Geohazard—Heavy Metals

4 of 30

  • Toenails, Tap Water and You: The Arsenic Connection
            • NS DNR Report of Activities: 2009

In unstable climatic conditions where rocks and soils

are saturated one week and dry the next there is a

higher risk of transport into groundwater systems.

Will that be our climate?

slide9

Assessing Geological Hazards

Geohazard—Acid rock drainage

4 of 30

Pyrite and pyrrhotite oxidize when exposed to air, resulting in production of sulphuric acid and iron oxides.

Sulphuric acid is soluble.

Picture from NASA Earth Science Division

slide10

Assessing Geological Hazards

Geohazard—Acid rock drainage

4 of 30

  • The amount of water that will fall in a ‘20 year return period’ rainfall (i.e., an event that has a 5% chance of happening any given year) will be:
      • 5% more rain fall by the 2020s
      • 9% more rain will fall by 2050s
  • 16% more rain fall by the 2080s.

Picture from NASA Earth Science Division

slide11

Assessing Geological Hazards

Geohazard—Slope stability

4 of 30

  • Slope angle?
  • What’s beneath our feet? On surface and underlying?
  • How saturated is it?
  • How warm is it?
  • different kind of assessment than coastal erosion
  • Slope Stability Guidelines for Development Applications

Picture from NS DNR Geological Services Division

slide13

Assessing Geological Hazards

  • Understand how climate change can trigger certain hazards
  • Are any of these hazards present in my jurisdiction?
  • Where?
  • Do they impose an intolerable risk?
  • How urgent is the need to respond?
slide14

Anne Warburton

awarburton@elementalsustainability.com

902 431 7168

www.elementalsustainability.ca